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Member States' use of revenues from the auctioning of EU ETS allowances, 2020-2024

This metadata overs the dataset containing information on how EU Member States spend the revenues from auctioning EU ETS emission allowances in one calendar year. More information on the EU Emissions Trading System (EU ETS) can be found here. The revenues from the auctioning of these allowances represent an increasing income source for Member States. This data is being collected under Article 19 of the Governance Regulation. The Regulation’s aim is to help the EU reach its 2030 climate and energy targets by setting common rules for planning, reporting and monitoring. The Regulation also ensures that EU planning and reporting are synchronised with the ambition cycles under the Paris Agreement. Reporting is mandatory for EU Member States. Some information is only mandatory to report if the data is available.

Total suspended matter, particulate organic matter and particulate inorganic matter from discrete water samples during RV MARIA S MERIAN cruise MSM129/1

This dataset was collected during the cruise MSM129/1 with RV MARIA S. MERIAN from Warnemünde, Germany to St. John's, Canada. It contains suspended particulate matter, particulate organic matter and particulate inorganic matter measurements [mg/l] from water samples collected from the seawater supply (Reinseewassersystem, RSWS) to calibrate the turbidity data of the RSWS system. The outflow of a PocketFerrybox that was connected to the seawater supply in the hangar was used for sampling. It takes a substantial amount of time for the water to reach the hanger from the intake point. The time delay between the sensor readings of the RSWS and the PocketFerrybox was determined and the timestamps of the water sampling were adjusted accordingly. Given latitute and longitude refer to this corrected timestamp. The original time of water sampling in the hangar is given as an additional column with the comment time of sampling. To obtain suspended particulate matter concentrations, water samples were filtered onboard through 0.7 μm pore size, glass fiber filters (Whatmann GF/F, 47 mm) under low vacuum. Filters were frozen immediately at -80 °C until gravimetric analysis in the laboratory at ICBM, Wilhelmshaven according to IOCCG recommendations.

Schwerpunktprogramm (SPP) 1685: Ecosystem nutrition: forest strategies for limited phosphorus resources; Ökosystemernährung: Forststrategien zum Umgang mit limitierten Phosphor-Ressourcen, Regulation of microbial activities, structure and function of microbial communities

In the frame of the project microbial turnover processes of phosphorous shall be investigated in forest soils and drivers for the corresponding populations as well as their activity pattern shall be described. Furthermore microbial transport and uptake systems for phosphorous should be characterized to understand the competition between plants and microbes for phosphorous in more detail, in relation to the availability of phosphorous and other nutrients. Therefore it is planned to investigate different soil compartments with different nutrient amounts (litter layer - rhizosphere - bulk soil). To reach the described goal molecular metagenomic methods will be used to characterize the structure and function of microbial communities as well as to describe the regulation of selected important pathways. In addition quantitative real time PCR and enzymatic measurements will be used to describe the abundance and activity of the corresponding populations and to describe their relevance for P turnover in the different soil compartments under investigation. With this we hope to reconstruct mainly the microbial phosphorous cycle and give important data to improve the model development of P dynamics in forest soils.

Use cases from the German NTSPortal on the systematic use of high-resolution mass spectrometry non-target screening data in environmental monitoring and chemicals management

Background Society aims for a pollutant-free environment, reflected in initiatives under the European Green Deal, which seek to reduce hazardous substances and promote safe, sustainable chemical use. Comprehensive exposure data are needed to identify sources, understand mixtures and eliminate sources of chemical pollution. High-resolution mass spectrometry non-target screening (HRMS NTS) is increasingly used in environmental regulatory context to chemically characterise the environment as completely as possible and retrospectively screen for known and emerging substances. Results This study provides use cases for monitoring and chemicals management with data from the German NTSPortal, a database and visualisation tool for HRMS NTS data from surface water and suspended particulate matter of major German rivers. Its internal spectral library enables substance identification comparable to standardised target analysis, supporting regulatory acceptance of HRMS NTS data for prioritisation and mixture assessment. To demonstrate its potential to research and regulation, we characterised the spatial and temporal distribution of riverine chemical mixtures and present selected use cases relevant to EU environmental, emission, and chemical legislation. Despite pronounced spatial variability, mixture composition based on presence–absence data remained stable over time, with 855 of 1721 substances detected at least once and 247 occurring ubiquitously. Declining trends for regulated substances such as carbendazim and climbazole illustrate the effectiveness of regulatory measures. Overall, the results showed that NTS data repositories can help overcome fragmented exposure information and enable more consistent use of monitoring data across policy areas, including evaluation of the revised Urban Waste Water Treatment Directive and One Health concepts. Conclusions Data from the German NTSPortal enabled a multi-matrix and temporal characterisation of riverine chemical mixtures, revealing both stable mixture compositions over time and persistent, catchment-specific substances. These data facilitated high-resolution mixture assessments across space and time, alongside trend analyses that meet regulatory needs in environmental monitoring and chemical risk assessment. Further temporal, spatial, chemical and matrix-spanning expansion of HRMS NTS repositories will enhance their value for environmental monitoring programmes. Strengthening interoperability, implementing FAIR data principles, and developing advanced tools for prioritisation, quantification and toxicity prediction, including AI-based approaches, will be crucial to fully realise the regulatory potential of NTS portals in the future. © The Author(s) 2026.

Vertiefung des Verständnisses des aquatischen Methankreislaufs durch innovative isotopische Ansätze und Untersuchung der Methanoxidation

Methan (CH4) ist ein potentes Treibhausgas, das zur globalen Erwärmung beiträgt und eine wichtige Rolle in der Atmosphärenchemie spielt. Aquatische Systeme wurden kürzlich als bedeutende Quellen von CH4 identifiziert, die bis zu 50 % zu den globalen CH4-Emissionen ausmachen. Es besteht jedoch weiterhin erhebliche Unsicherheit über das Ausmaß dieser Emissionen, insbesondere über deren räumliche und zeitliche Treiber. Dies gilt besonders für CH4-Emissionen aus den aquatischen Systemen der Arktis, die bisher kaum untersucht wurden. Um das Verständnis des globalen CH4-Budgets zu verbessern, ist es daher entscheidend die Quellen von CH4 in aquatischen Systemen genau zu charakterisieren und zu klassifizieren. Aktuelle Methoden zur Klassifizierung von CH4-Quellen nutzen stabile Isotopenverhältnisse wie stabile Kohlenstoff- (delta13C) und Wasserstoff- (delta2H) Isotopenwerte von CH4 (13C vs. 2H Diagramme) sowie geochemische Bernard-Verhältnisse, welche die molaren Verhältnisse von CH4 zu Ethan und Propan gegen delta13C-CH4 Werte darstellt (Bernard-Diagramme). Beide Diagramme werden verwendet, da verschiedene CH4-Quellen durch spezifische Bereiche von delta13C- und delta2H-CH4-Werten sowie Bernard-Verhältnissen charakterisiert sind. Eine wesentliche Einschränkung ergibt sich aus der CH4-Oxidation (MOx) durch methanotrophe Bakterien, die in aquatischen Umgebungen weit verbreitet sind. Dieser Prozess verändert die CH4-Konzentrationen und stabilen Isotopenwerte sowie die Ethan- und Propankonzentrationen, wobei die Oxidation dieser Gase bezüglich der CH4-Quellenklassifizierung bisher unberücksichtigt bleibt. Dies kann zu einer erschwerten Klassifizierung von CH4-Quellen bis hin zu Fehlinterpretationen führen. Ein vielversprechender neuer Parameter, um die Klassifizierung von CH4-Quellen in dieser Hinsicht zu verbessern, ist der sogenannte Delta(2,13)-Parameter, der auf den delta13C- und delta2H-Werten von CH4 basiert, jedoch zusätzlich für die durch MOx verursachte Isotopenfraktionierung korrigiert. Derzeit beeinträchtigen jedoch die begrenzte Nutzung des Delta(2,13) Parameters sowie fehlendes Wissen über potenzielle Einflussfaktoren seine Zuverlässigkeit und erfordern eine systematische Untersuchung. Das Ziel von AMIOX ist es, das Verständnis des aquatischen CH4-Kreislaufs zu vertiefen, indem die Klassifizierung von CH4-Quellen und -Senken in gemäßigten und arktischen aquatischen Systemen verbessert wird. Dies soll durch die Einführung des neuen Delta(2,13)-Parameters in Kombination mit Bernard- und 13C vs. 2H-CH4 Diagrammen erreicht werden. Um diese Ziele zu erreichen, werde ich den Einfluss von MOx auf die Delta(2,13)-Werte und Bernard-Verhältnisse durch drei weit verbreitete methanotrophe Spezies in Laborstudien unter verschiedenen Umweltbedingungen untersuchen. Schließlich werde ich die erworbenen Erkenntnisse im Feld anwenden, um das Verständnis des CH4-Kreislaufs in Seen in gemäßigten Breiten in Deutschland und arktischen Seen in Grönland zu verbessern.

Distribution and concentration of nutrients, carbon compounds and methane in water samples in the southern German Bight (North Sea) in November 2025, during the MOSES Sternfahrt 12

Previous Sternfahrten were mainly conducted in spring and summer. To cover the seasonal aspects more thoroughly, including a winter situation, this cruise was conducted in late autumn (20 -22 November 2025 ). We used the RV Heincke (cruise HE673/2) instead of the RV Uthörn. The Heincke's draught is greater, so we could not reach all of our previous stations. Surface and bottom water samples were taken with a rosette.

Forschergruppe (FOR) 5094: Dynamik des tiefen Untergrundes von Hochenergiestränden, Teilprojekt: Morphodynamik, Grundwasserströmung und -transport

Durch DynaDeep wird ein Verständnis der Funktionsweise und Relevanz des Land-Meer Übergangs im Untergrund von Hochenergiestränden gewonnen werden. Wir nehmen an, dass dieser einen hoch dynamischen Bioreaktor und einzigartiges mikrobiologisches Habitat darstellt und Netto-Stoffflüsse in Richtung Meer stark beeinflusst. Um dieses Ziel zu erreichen werden sechs Teilprojekte gemeinsam Felduntersuchungen und experimentelle Arbeiten durchführen und diese mit mathematischen Modellen integrativ kombinieren. P1 wird Grundwasserströmungs- und -transportprozesse als Funktion hydro- und morphodynamischer Randbedingungen untersuchen. Wir postulieren, dass die gegenwärtigen Konzepte zur Grundwasserströmung und Salzverteilung in subterranen Ästuaren unter Tideeinfluss für Hochenergiebedingungen nicht anwendbar sind. Stattdessen erwarten wir dynamische und variable Änderungen von Salinitäten, Fließrichtungen und Aufenthaltszeiten. P1 wird die Strandmorphologie mit Hilfe von Kameraaufnahmen, Laserscannern und Drohnen untersuchen und diese mit numerischen Modellen kombinieren, um typische Adaptionszeiten und -skalen der Strandmorphologie abzuleiten. Durch nicht-invasive geophysikalische Methoden werden die Salzverteilungsmuster im Untergrund zu verschiedenen Zeiten abgeleitet werden. Umwelttracer werden genutzt, um Aufenthaltszeiten im Untergrund zu bestimmen. Morphologische, hydro(geo)logische und geophysikalische Daten des STE Online Observatory dienen der Erstellung numerischer Modelle, die Grundwasserströmung und Salztransport abbilden. Die Kenntnis der Verteilung von Wasserkörpern und -grenzflächen, Fließgeschwindigkeiten, Aufenthaltszeiten und des Ausmaßes der Mischung im Untergrund bildet die Grundlage für die biogeochemischen Untersuchungen in den Teilprojekten P2-P6.

Total alkalinity and pH in the alkalization mesocosms of a chronic Ostrea edulis alkalinity-enhancement exposure experiment

This dataset contains repeated measurements of seawater pH and total alkalinity recorded in the alkalinization mesocosms, a set of tanks without oysters that received the same alkalinity treatments as the exposure mesocosms reported in a companion dataset. Total alkalinity was raised in three alkalization cycles to reach target increases of +250 or +500 µmol/kg over unamended seawater, using either dissolved alkalinity addition (NaOH and CaCl2) or olivine-based coastal enhanced silicate weathering. The three cycles ran 17 April to 7 May 2024, 8 May to 27 May 2024 and 30 May to 19 June 2024. Measurements were taken predominantly in triplicate per treatment and sampling day. Seawater pH was measured with a pH electrode and total alkalinity by open-cell potentiometric titration, both on a Metrohm 855 Robotic Titrosampler.

Distribution and concentration of nutrients, carbon compounds and methane in water samples in the southern German Bight (North Sea) in February 2025 , during MOSES Sternfahrt 13

Previous Sternfahrten were mainly conducted in spring and summer. To cover the seasonal aspects more thoroughly, including a winter situation, Sternfahrt 13 was conducted in February 2025 (10–12 February). We used the RV Heincke (cruise HE653/2) instead of the RV Uthörn. The Heincke's draught is greater, so we could not reach all of our previous stations. Surface and bottom water samples were taken with a rosette; in the event of stratification in the water column, an additional sample was taken from the middle.

EU Climate Policy Tracker

The EU Climate Policy Tracker (EU CPT) presents up-to-date developments in climate and energy policies in the EU-27. Although government policy is the single most influential driver behind the fight against climate change, there is limited information about the status of the policies that influence increases or decreases in emissions. The EU Climate Policy Tracker (EU CPT) is intended to bridge this gap. The project holds two references in focus at the same time: a 2050 goal of near total decarbonisation, and our current policy trajectory. A uniquely developed scoring method, modelled on appliance efficiency labels (A-G), gives an indication of how Member States are doing compared to a low-carbon policy package. This results in aggregated scores, supported with a rich background of information, for all Member States, at EU level, and for different economic sectors. The project is intended to be a resource for those seeking information, a means of sharing best practice, and a way of holding policymakers to account. In 2011 we updated our initial rating from November 2010. The findings of 2010 showed that the average score across the EU was an E, indicating that the level of effort needed to treble to be on track to reach the 2050 vision. Looking at the developments in 2011, we can see that there has been considerable activity in many countries, though the overall scoring has generally remained constant: positive actions are counteracted by negative developments or budget cuts. The EU CPT is a joint project by Ecofys and WWF. The project is funded by the European Climate Foundation. Visit the EU Climate Policy Tracker on: www.climatepolicytracker.eu.

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